If you know what is been born again, then you should know what prosperity is. when you are born again, you have recieved salvation, and prosperity has become your benefit. But brother read Eph. 4: 17 and 18, prosperity is a choice, so if you dont want or like it, you better short up and remain poor.

In the book of Mal.3 from vas. 8 start by commanding us not to rob God, therefore the the nurber one answer to to the question is YES, is a sin.
for the bible say in the book of Exe. 20 Vs 8; says you should not still, now you get to find out that robbry is the art of stilling, so not paying of tithe is obsolutly sin.